I know we live in the app age now but apps don't have many of the properties that SMS and phone calls have, including that they aren't federated and typically d

I know we live in the app age now but apps don't have many of the properties that SMS and phone calls have, including that they aren't federated and typically disallow alternative clients. Due to this, you can't just use some secure app, but you have to use the app that the people you want to stay in touch with use. For SMSs you have a very wide choice of frontends. I'm already using non-SMS apps but I'd love them to become more like SMSs: federated and with free client choice. Edited to add: Also, as long as phone calls and SMS are around and used we should strive to work to make them more secure.